Pressure Switch
Maintenance / Adjust
A5.05. 11.06.06.02
M20/M25/M32/M43
en / 26.11.2010 IB025583 1/2
11
See also: 11.06.05.nn
Spare parts list:
Time requirement: 1 Pers./ 0,25 h
Personnel qualification: skilled engine hand
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Operating medium: Heavy fuel and distillate fuel
Tools:
Pressure calibrating device W1*
Electric continuity tester (multimeter) W2*
* no picture
Procedure:
1. Mount new pressure switch, see A5.05.11.06.05.nn.
2. Close shut-off valve (Fig. 3/6) of the corresponding medium to the pressure pipe.
2.1 Remove the plug from the pressure switch and connect the pressure calibrating device (W1) to
the test connection. The adjustment value is to be inferred from the list of measuring points, see
"engine documentation, chapter "Control/Regulation".
2.2 In pressureless state the pressure switch contacts (Fig. 1)
1 + 2 are closed and contacts 1 + 3 are open (ohmic flow).
2.3 When the pressure drops, the pressure switch should switch at the measuring point value, in this
state contacts 1 + 2 are open and contacts 1 + 3 are closed.
2.4 If a pressure switch is replaced, the switching value is to be inferred from the list of measuring
points.
(The measuring point number is indicated on the cable or the related nameplate.)
NOTE
If the pressure switch responds before or after the read limit, the switching point has
to be readjusted, see item 3.
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